滑动摩擦和滚动摩擦在某些情况下较难区分.有的同学认为,只要出现转动,就存在着滚动摩擦.这种认识是不正确的.为了正确地分析和掌握滑动摩擦和滚动摩擦,下面介绍一种判断方法.两个物体相互接触,它们之间必然存在着相互接触的点和面,对于滑动摩擦来说,其中一个物体上的接触点或接触面始终不改变,而另一物体上的接触点时时刻刻都在改变着.对于滚动摩擦来说,两个物体相互接触的点都在时时刻刻地发生改变.如果两物体上的接触点或接触面都不改变,那将是 Sliding friction and rolling friction are difficult to distinguish in some cases. Some students believe that as long as there is rotation, there is rolling friction. This understanding is incorrect. In order to correctly analyze and grasp sliding friction and rolling friction, the following A method of judging is introduced. Two objects are in contact with each other, and there must be points and surfaces that are in contact with each other. For sliding friction, the contact point or contact surface of one of the objects does not change, while the other object does not change. The point of contact is changing all the time. For rolling friction, the point at which two objects touch each other changes from time to time. If neither the contact point nor the contact surface on the two objects changes, it will be